Houston-based Partners in Building is expanding in the Texas Hill Country.

The custom home builder has opened an office in Boerne, about 30 miles north of San Antonio, to serve customers who are purchasing land in large-lot communities in the region.

“About one-third of our Hill Country business comes from Houstonians who are building second homes or building with an eye toward retirement. This has been a very steady and sustained trend, and it is growing,” Jim Lemming, president of Partners in Building, said in an announcement

Partners in Building has launched an expansion in Cordillera Ranch, a 7,000-acre resort-style community near Boerne. The company will build in The Springs neighborhood, the first section of Cordillera Ranch where builders will contract to purchase lots and sell homes directly to buyers.

The Cordillera Ranch development offers lots ranging from less than an acre to more than 12 acres in size.

The typical “build on your lot” home built in Cordillera Ranch by Partners in Building will contain about 4,000 square feet and be valued at $700,000, not including the land, Lemming said.

In The Springs at Cordillera Ranch, homes will be offered on lots measuring ¾ to 1 acre with prices starting around $600,000. That price includes the lots.

Partners in Building will build a model home and will have 16 home sites in the initial development, which will is planned to open in mid-2015.

Will Tucker, an area construction manager for Partners in Building since 2008, has been promoted to Hill Country Project Manager to oversee growth in the region. The company aims to tap into the demand for large lot communities opening along the U.S. 281 corridor from north San Antonio to Johnson City.

Partners in Building sold more than 200 homes in Houston and Austin last year.